DESCRIPTION

GNU cpio is fully documented in the texinfo documentation. To access
the help from your command line, type
info cpio
The online copy of the documentation is available at the following
address:
http://www.gnu.org/software/cpio/manual

KNOWN ISSUES

The cpio utility uses a default block size of 512 bytes for I/O opera-
tions. If a tape device does not support this block size, cpio may
fail with the following error message:
cpio: read error: Cannot allocate memory
To work around this issue, modify the default block size with the
--block-size long option.
CPIO(1L)